Improvement in jig-saws



UNI'IED STATES PATENT OFFICE.

EDMUND H. BENEDIOT, OF NEW YORK, ASSIGNOR OF ONE-HALF HIS RIGHT T0 GEORGE H. 'OLARKE, OF BROOKLYN, N. Y.

IMPROVEMENT IN JlG-SAWS.

Specification forrning art cf Letters Patent N0. 174, [05, dated Februa.ry.29, 1876; application filed Augus t 18, 1875. Y

T0 all whom it may concern;

Be it known that I, EDMUND H. BENE- DIOT, of the city, county, and Staate 0f New York, have invented certain Improvements in J ig-Saws, 0f which the following is a specification:

My invention relates 110 jig' saws; and 0011 -sists in a novel construction, co1nbiuation, a11d arrangement 0f parts and it has for its object to produce a machine simple in 0011- struction und easy and stea-dy in operation, which is in itself portablqand which nr.my be witl1 f-neility secured to any table, bench, 01 otsher support by being elamped thereto, 218 will be fully hereafter sei; forth.

The drawing is 21 perspeetive view of my machine.

A is 'nhe fra-1ne, corresponding in shnpe very nearly 130 the letzter G. B B are jaws (rast 011 t'he rear of the frzune. C is 21 clampiugscrew passing through the l0wer jaw, und providedwvith a head, a. D is the tuble 0t' the machine f0r supporting the work. Lt is circular, mny be 0f any suitable 01 desired material, a.nd is provided With a centrnl hole, through Which tl1e sn.w passes. The arm A of the fram6, which overhangs the table D, has abits extre1nity 21 sleeve, E, whieh is 1111- mediately over the center of the table. Through this sleeve 01 guide asses the r0d F, whieh is provided with a head, b,-at its upper extrernity, 211111 is niehed ab c, a.s shown. A pin, d, projecting fron1 this rod enters the slot ein the sleeve, thus preventing the rod from turning in the sleeve. A spring, f, is interposed between the l1ead b 05 tl1e 170d and tl1e sleeve E, whieh has a tendeney t0 keep the rod raised. The frame i1n1nediatzely under the table D is formed. into guides g g, in

wbich reciprocates t;he r0d G. lhis rod has a. niche at its upper extre1nity similar t0 tl1e niehec 0n the 101l' F. (Ehe niehed ends of both rods are split t0 ad1nit the extremitics 0f tl1e sa.w h. A pin, z, 011 euch extremity 0f thesa.w catch(as i11t0 the niches 011 the ends of the rods when the extremities of the saw are inserted 111130 the slots in the ends of the rods. H is 21 disk seeured t0 a. short shaft journaled in -the fra1ne. I is a lever pivoted to theframe at j, and pin-jointed als one extre1nity 130 the rod G a.t k, so tha.t as in oseillates this rod receives a reciprocating motion.

The other extremity of this lever is slotted,

as shown, and 111110- the slot a. studl projecting fro1n the side 0f the disk H, takes. J is a. balance-wheel secured to the sli1afl: of thedisk H. K is a frictional driving-wheel. The periphery 0f this wheel, and if necessary that 0f the disk also, may be covered with some materialindia.-rubber, f0r instance-wlxich will cause fricbion of the 011e against the other,

'it being understood tlrat; ehe peripheries 0f the wheel anddisk are in contaet.

Tl1e operation 0f Ll1e machine requires but litte explzmation. 011 the wheel K being re volved t;he disk H in frictionnl contact therewitlr reeeives 21 rot-ary 1110171011, and the stud l working in the slot in t-he lever I imparts t0 this lever an oseillating 1notion, 211111 thus the rod G, t0 which the lever is pivoted, is reciproeated, and, the saw h operated 0r jigged up and down, the spring f keeping it distended, and the 1novement 0f tl1e stud lin the sl0t eontinualiy changing the point; ab Whieh the p0wer is appli d to the lever, and thus creating -a variable 1n0ti011, which is sl0wer and 1nore powerful when t;he sa.w is cutting through the stuff in its downward stroke than when the saw is performi ng its upward stroke.

T0 overeome 0r balance the jierk Which the spring would give wl1en the stand l pnssed the .upper dead center, and t0 equalize the molzion 0f the parts, 21 balance-wheel, J, is secur'ed 011 the s'hzrft; 0f the disk H.

The wheel K may be provided with a. orankhandle when it is desired t0 operate the 111a.-

chine by band, 0r 1't; may be driven b y n1eans of 21 treadle.

I claim- The portable jig-saw macl1ine, herein shown and described, consistiug of the fra-me A with jaws B B and screw G, table D, rods F and G, spring f, slotted lever I, disk H, wheel K, and wheel J, eonstrueted und operating substaytially in tl1e 1nanner described and specifiet 2. Ylhe combina.tion of the disk H, slotted lever I, rods G and F, m1d spring f, support ed and working 011 the frame A, substantially in the manner deseribed and speoified'.

EDMUND H. BENEDICT.

W1tnesses:

E. H. JOHNSON, J. P. CRAWFORD. 

